Pyrazolo 4,3-d!pyrimidine-5,7-(4H,6H)dione or -5-thione-7-one analogs

摘要

Various novel analogs of pyrazolo 4,3d!pyrimidine-5,7-(4H,6H) diones and also 5-thione-7-ones, novel methods of synthesis therefor, compositions and uses are the present invention. For example, the novel 5, 7-diones and 5-thione-7-ones are useful for stimulating the central nervous system reversing bronchoconstriction, and as cardiac stimulants cardiotonic agents.